Sounds like Ruth and I charge much the same - $300 plus cost of supplies based on number of people. I usually do demo with limited hands on - I'll show the first person how to dip or whatever - then they get to show the next person - they cycle through. So I might get them to dip oreos in milk chocolate - each person dips a couple - then show them some basics of decoration - hand over a couple of squeeze bottles of tempered white and dark and let them have at it. I might get them to dip some liquorice sticks or big pretzels etc - again decorate with the contrasting chocolate. With a microwave and extra squeeze bottle lids I keep the decorating chocolate warm and in temper.
I might demo making some solid molds. They need enough time to set and a fridge to carry off the latent heat - they are usually ready to be knocked out by the end of the event if I make them first.
With remaining chocolate I usually have them make barks.
I take a bunch of cello bags - let them package their stuff in cello - or for people who come to the house to learn I usually suggest they bring some containers (perhaps the plastic containers you get when you order chinese food or the disposable Ziplock containers.
Each person would leave with the couple of oreos they had decorated, a couple of pieces of liquorice, some bark.
